v3.10.0.1

FAIR VALUE OF FINANCIAL INSTRUMENTS - Non-Recurring basis (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Goodwill, Impairment Loss | $ 0 | $ 441
Impairment - Market Assets | 2,100 |
Impairment - Assets Held for Sale | 26,900 |
Impairment - Bonneville Assets held for Sale | 25,600 |
Impairment - Other assets held for sale | $ 1,300 |

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